High Frequency Transformer Resistance Increases

Oct 27, 2017

High Frequency Transformer Resistance increases

High-frequency transformer production quality problems are also made when the high-frequency transformer is easy to make mistakes, the transformer is the exchange of AC voltage, current and impedance of the device, when the primary coil with AC current, the core (or core) Generate AC flux, so that the secondary coil induced voltage (or current). High-frequency transformer production process is generally divided into: winding, solder, assembly, impregnation, testing several parts to complete. There are several kinds of mistakes that are common.

1. Wire with the wrong lead to increase the resistance of the transformer and heat

High-frequency transformer main wire for the polyester enameled wire and three insulated wire, if it is demanding (such as power switch transformer), the use of three insulated wire, if it is required in general, then the polyurethane products are no problem! Some specifications almost the same diameter, the naked eye can not be identified, need to use caliper and other measuring instruments. The hair process is very easy to make mistakes wire diameter, wire diameter will lead to increased resistance to increase the heat of the transformer, the diameter will make the winding ratio is too large to make the whole package larger, because the core window is limited and lead to core Assembly difficult.

2. Solder caused by a short circuit

Tin furnace temperature is too low products easy to solder, the pin is not bright, high temperature to control the solder time, not too deep solder phenomenon, due to high temperature, too deep solder may melt insulation tape, resulting in short circuit. Help welding agent can be a good job to do more with less.

3. Assembly of the core caused by winding on the core, shielding breakdown

Assembly transformer is required to wrap around the coil with a magnetic core or core on it. Seemingly simple, it is not true, the core package is full when the core is the easiest to break through the outsourcing of tape led to enameled wire exposed or hit the core, the transformer hit the voltage caused by winding on the core, shield breakdown.

4. Impregnation does not affect the insulation strength, fixed

Ordinary impregnation due to insufficient penetration, will affect the high-frequency transformer insulation strength, fixed, the transformer will appear noise and magnetic core loose phenomenon, seriously affect the quality of high-frequency transformers. Vacuum impregnation can effectively improve the permeability of the insulating paint, increase the filling rate, thereby improving the overall mechanical strength of the coil, insulation strength and moisture, mildew and other properties. 5. Test the wrong conditions and test the invalid results

High-frequency transformers generally require test items with turns ratio, inductance, voltage, leakage inductance and so on. The test is to take the initiative to deal with and prevent, so as not to send the finished product to the client when there are still bad products appear. Testing is also the key to ensuring the quality of high-frequency transformers, so operators require careful and familiar with the test equipment debugging.